Influence of zirconia addition on the microstructure of K0.5Na0.5NbO3 ceramics

Malič, Barbara; Bernard, Janez; Benčan, Andreja; Kosec, Marija

doi:10.1016/j.jeurceramsoc.2007.11.004

Cited by 123 publications

(77 citation statements)

References 22 publications

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“…The apparent density was measured by the Archimedes method and the porosity was determined using the theoretical density 5 . The crystalline phases were assessed by X-ray diffraction, using a Philips PW1830 diffractometer running with CuKα radiation, at 40kV and 30mA.…”

Section: Methodsmentioning

confidence: 99%

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Effect of ZnO addition on the structure, microstructure and dielectric and piezoelectric properties of K0.5Na0.5NbO3 ceramics

2014

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Microstructure, structure and electrical and dielectric properties of ZnO-doped K 0.5 Na 0.5 NbO 3 (KNN) ceramics were investigated. Powders were obtained by the conventional solid-state method. Samples doped with 0 to 1 mol% of ZnO were sintered at 1125 °C for 2 h. Through XRD spectra, the perovskite structure was detected, in addition to small peaks corresponding to secondary phases. It was also observed that zinc changed the microstructure and grain size of KNN ceramics. The addition of 0.5 mol% of Zn 2+ produced a softening effect in the ferroelectric properties of the material, and increased its final density. Conversely, the addition of 1 mol% of Zn 2+ reduced the sample densification.

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Section: Methodsmentioning

confidence: 99%

“…Nevertheless, the dielectric and piezoelectric properties of pure KNN are relatively low (d 33 ~90 pC/N) as compared to those achieved with PZT. This makes the replacement of conventional PZT with KNN very difficult [5][6][7] . To solve this problem several options have been studied.…”

Section: Introductionmentioning

confidence: 99%

Effect of ZnO addition on the structure, microstructure and dielectric and piezoelectric properties of K0.5Na0.5NbO3 ceramics

2014

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“…Effect of other ions such as Ag, Nb, Ta, Bi, Cu, Ca, etc. and combination two or three cations on KNN-LS ceramics were also studied by many authors [96][97][98][99][100][101][102][103][104][105][106][107][108] and promising results were reported. Wang et al reported that addition of Ag in KNN-LiTaO 3 ceramics increases the Curie temperature (T c = 438°C) and piezoelectric properties (d 33 = 252 pC/N) of the ceramic by normal sintering technique [109].…”

Section: Knbo 3 -Based Ceramicsmentioning

confidence: 99%

Review: environmental friendly lead-free piezoelectric materials

2009

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Lead zirconate titanate (PZT) based piezoelectric materials are well known for their excellent piezoelectric properties. However, considering the toxicity of lead and its compounds, there is a general awareness for the development of environmental friendly lead-free materials as evidenced from the legislation passed by the European Union in this effect. Several classes of materials are now being considered as potentially attractive alternatives to PZTs for specific applications. In this paper, attempts have been made to review the recent developments on lead-free piezo materials emphasizing on their preparation, structure-property correlation, etc. In this context, perovskite systems such as bismuth sodium titanate, alkali niobates (ANbO 3 ), etc. and non-perovskites such as bismuth layer-structured ferroelectrics are reviewed in detail. From the above study, it is concluded that some lead-free compositions show stable piezoelectric responses even though they do not match the overall performance of PZT. This has been the stimulant for growing research on this subject. This topic is of current interest to the researchers worldwide as evidenced from the large number of research publications. This has motivated us to come out with a review article with a view that it would give further impetus to the researchers already working in this area and also draw the attention of the others.

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“…At higher doping levels, secondary phase formation and abnormal grain growth has been reported [45]. ZrO 2 addition hinders the abnormal grain growth in KNN ceramics and enhances the relative permittivity up to 905 at 10 kHz [46]. Figure 5.7 displays the piezoelectric constant of different KNN-based compositions as a function of the orthorhombic-tetragonal phase transition temperature.…”

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confidence: 90%

Lead-Free KNN-Based Piezoelectric Materials

Safari

Hejazi

2011

Lead-Free Piezoelectrics

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Sodium potassium niobate with the general chemical formula of K 1 À x Na x NbO 3 (KNN hereafter) is one of the most attractive lead-free materials which have been extensively investigated throughout the last decade.KNN is a solid solution of NaNbO 3 (NN) and KNbO 3 (KN) compounds. A KNN phase diagram comprised of the tetragonal, orthorhombic, and monoclinic ferroelectric regions and an orthorhombic antiferroelectric region is depicted in Fig. 5.1.The phase transitions and variations of dielectric properties of pure KNN vs. temperature resemble those of BaTiO 3 (BT), but every transition occurs at a higher temperature compared to BT ceramics.

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Influence of zirconia addition on the microstructure of K0.5Na0.5NbO3 ceramics

Cited by 123 publications

References 22 publications

Effect of ZnO addition on the structure, microstructure and dielectric and piezoelectric properties of K0.5Na0.5NbO3 ceramics

Effect of ZnO addition on the structure, microstructure and dielectric and piezoelectric properties of K0.5Na0.5NbO3 ceramics

Review: environmental friendly lead-free piezoelectric materials

Lead-Free KNN-Based Piezoelectric Materials

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